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Letters Patent No. 62,296, dated February/'19,- L867.

IMPROVEMENT IN ARTIFICIAL TBETH.

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TO ALL WHOM IT MAY CONCERN: Be it known that I, SAMUEL 'W. STO'CKTON, ofthe city of Philadelphia., in the State of Pennsylvania, have invented a new and usefullulprovement Vin Artificial Teeth; and I do hereby declare that .the following is a ful-l, clear, and exact description of the construction of the same, reference being had to the accompanying drawings, making a part of this specieation,`in which- Figure 1 represents the inner or rear side of a single tooth,

Figure 2, a like representation of a block or series of teeth, having my said improvement applied thereto; and i Figure 3, a vertical transverse section of fig. 2 on the dotted line x of the latter- Like letters of refci'ence 'indicating the same parts when in the different figures. Y

The object of my invention is the production of a cavity 'or cavities in the inner'orrear side of the body of a porcelain tooth, or block of teeth, for the reception of the vulcanite of the base to which such teeth are applied, which will afford a more reliable and effective means offastening the one to the other. i

It consists of a longitudinal cylindrical hole and a transverse cylindrical hole intersecting each other at nearly a right angle within the upper Aportion orbody of the tooth, together with a slot narrower 'than the diameter of either of the said holes, andAopening the included sides of the latter to the-exterior, as hereinafter set forth :n'd described. i i

In the drawings, A is the body, b-the longitudinal hole, c the transversehole, and d the opening slot between them. The two holes b and c: meet Within the body A, (see iig. 3,) and the slot d forms an open communication between them along their whole lengths. The slot d is narrower than the respective diameters of the holes b c, and consequently leaves a projection alongl on each side between the slot and the hles, as seen in figs. 1 and 2. It will therefore be seen that when the said holes and slot are filledwith the vulcanite of the base to which the tooth or block of teethv are to be applied, and the vulcanite then hardened by` heat and pressure inthe usualV well-known manner, the said tooth or block of teeth will be firmly held to the baseiby a vulcanite tenon which.

fills the entire cavity of each tooth, and, therefore, cannot be Withdrawn. The holes b and c are readily and quickly made by means of a globular-headed drill, and the slot d by means of a fine saw or file, Whilst Vthe body A is in the dried state which precedes the baking process; and the innerends of thesaidholes may be'also readily enlarged by the said drill, if so desired.

I do not desire to claim, broadly, a cavity in the body of a tooth for the reception of-a vulcanite as a fasty ening for 'the same; but, having fully described the peculiarity of my improvement in artificial teeth, what I claim as new therein of my invention, and desire to secure by Letters Patent,` is l i The two holes b and c, in combination with the slot d; -theV same being constructed in the body A of a porcelain or artificial tooth or block of teeth, sbstantially as and for the purpose set forth and described.

S. W. STOCKTON.

Witnesses:

BENJ. MoRrsoN, WM. H'. MoRrsoN. 

